--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/instrument/SLInstrumenter.java	Thu Aug 21 13:28:22 2014 -0700
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.sl.nodes.instrument;
+
+import static com.oracle.truffle.api.instrument.StandardSyntaxTag.*;
+
+import com.oracle.truffle.api.instrument.*;
+import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.sl.nodes.*;
+import com.oracle.truffle.sl.nodes.controlflow.*;
+import com.oracle.truffle.sl.nodes.local.*;
+import com.oracle.truffle.sl.runtime.*;
+
+/**
+ * This is a general purpose visitor which traverses a completely parsed Simple AST and instruments
+ * all the nodes within it. This visitor is designed to visit the tree immediately after it has been
+ * parsed.
+ *
+ */
+public class SLInstrumenter implements NodeVisitor {
+
+    private final SLContext context;
+
+    public SLInstrumenter(SLContext context) {
+        this.context = context;
+    }
+
+    /**
+     * Instruments and tags all relevant {@link SLStatementNode}s and {@link SLExpressionNode}s.
+     * Currently, only SLStatementNodes that are not SLExpressionNodes are tagged as statements.
+     */
+    public boolean visit(Node node) {
+        // We have to distinguish between SLExpressionNode and SLStatementNode since some of the
+        // generated factories have methods that require SLExpressionNodes as parameters. Since
+        // SLExpressionNodes are a subclass of SLStatementNode, we check if something is an
+        // SLExpressionNode first.
+        if (node instanceof SLExpressionNode && node.getParent() != null) {
+            SLExpressionNode expressionNode = (SLExpressionNode) node;
+            Probe probe = expressionNode.probe(context);
+            // probe.tagAs(STATEMENT);
+
+            if (node instanceof SLWriteLocalVariableNode)
+                probe.tagAs(ASSIGNMENT);
+
+        } else if (node instanceof SLStatementNode && node.getParent() != null) {
+
+            SLStatementNode statementNode = (SLStatementNode) node;
+            Probe probe = statementNode.probe(context);
+            probe.tagAs(STATEMENT);
+
+            if (node instanceof SLWhileNode)
+                probe.tagAs(START_LOOP);
+        }
+
+        return true;
+    }
+}